sp15 has picked and answered your questions on the Swedish vehicles:
“Will there be anything else besides the one light/medium line?”
-The light/medium line will not be part of the tech tree introduction. If it comes it will happen later on.
“Do you think we can expect more than one line (i.e. a line of MTs and a line of TDs) with the initial release of the Swedish tree in World of Tanks?”
-I will not comment on what line or lines that will be in the tech tree introduction. Though you shouldn’t have to wait much longer for that information. Well other than the above.
“Are there any possibilities for a Heavy or SPG line”
-Yes. For information on the heavies, you should check out my articles on them. As for SPG’s we have a basic line worked out with solid tier 3-10 candidates but I wouldn’t expect to see that line anytime soon.
“I would like to ask about the reality behind tanks. Were all of these vehicles produced, or there are some paper/partly made up vehicles.”
-As with any tech tree, there will be vehicles that never left the drawing board. Everything you will see is based on a real project, most of which I have covered throughout my Swedish tanks series of articles.
“what is the primary thing, that makes a difference from the other nations?”
-The two things that come to mind is the size and gun depression. Swedish heavy tanks, tank destroyers and mediums will be smaller and lighter than you might expect. Swedish tanks also have a minimum of 10 degrees of gun depression and in some cases up to 15dg or even greater.
“Which Books would you recommend on the Swedish tank development history, particularly the first half of the century until 1945?”
-Unless you read Swedish there are none that I am aware of. There are however a few Swedish books I could recommend: Svenskt Pansar by Rickard O. Lindström & Carl-Gustaf Svantesson, Landsverk I Landskrona.
I would also recommend you check out the Pansar magazines by SPHF (Swedish historical armor association) just be aware that they are also in Swedish.
“What is the most interesting things you have found while researching the line.”
-From the top of my head, the Swedish plans for liberating of Denmark before the allies in 1945 was quite an interesting find. But if we are talking tank related finds I would have to go with the documents from the various UDES projects from the 70s. They are a goldmine of strange and experimental ideas from right before the introduction of composite armor.
“what has been the most difficult”
-Making compromises with WG when it comes to the structure of the tech tree. More about that after the initial line(s) are revealed.
“Do you think hydraulic suspensions will be added if the Strv 103 was to become the Swedish top tier tank?”
“How many of the tanks will be remodels from other trees maybe with different cannons but otherwise same”
-There will only be original Swedish tank designs in the Swedish tree. However, there is already a “remodel” of a Swedish tank design in the game in the form of the Toldi 3.
“How many crewmembers will be in the premium tank and will the first tech tree contain tanks with more/less crewmembers?”
-The strv m/42-57 Alt.2 will have 3 crew. Swedish tanks will have between 3-4 crew and most Swedish top tier vehicles will have 3 crew as well.
“In terms of Ammunition development did the Swedes prefer Chemical penetrators or Kinetic penetrators and what sort of standard/premium ammunition are we likely to see in the tree?”
-HEAT rounds were generally only used for howitzer armed vehicles but also did appear on a few other vehicles like the heavy tanks. However, most Swedish tanks use AP & APDS rounds.
“Is the Strv 103 a TD?”
-Historically no the Strv 103 was designed and used in the role of a medium tank/mbt.
“How many Swedish vehicles could fit into WoT”
-Currently, Sweden can realistically fill 4 full branches and one mini branch. These include top tiers for all vehicle classes.
“What is going to be used for Swedish desert camo”
-Something WG made up most likely. WG has not consulted with me or any other expert on the matter of camo and the ones we have seen thus far have been made up.
The only historical desert camo option would be this the camouflage used by Swedish UN peacekeeping troops during the Kongo war.

Thank you, everyone, for sending Qs and sp15 for providing the answers.