Fantastic news! I personally, have yet to get into Big Finish and I won't lie in saying that the Daleks are among my least favorite monsters - but! - I am over the moon for everyone who is a fan, and needs the War Doctor, as I surely know they're are hundreds of people doing cartwheels over this, awesome
That said - depending on how they look, I'll probably buy the Seventh and I might buy the 8th - I went to great pains to DIY a dark eyes 8 (betting they'll use the extra head that came with the War Doctor) so it'll depend on how different and how much of an improvement they are versus what I have.
This does mean I can buy both Tardis' though, and - like many - definitely placing my bets on a two doctors set as Al hinted at a multi doctor set. Perhaps they'll paint the Brigadier's hair grey and release him with Ace and 7 to make a Battlefield set? Fits the "another dimension" hint?
Curious about the 4th Doctor - I'd scream if it was Ainley, S18 Baker and, someone else..., not getting my hopes up though. What theoretically could they re-release? 4th variant, Cyberman, Timelord?