But wouldn´t it encourage fans of the first edition to buy the second edition as well. Sure there are a lot of fans that will do it either way, but it definetly would throw another incentive out to buy the second edition.
What incentive? Buy 2e so you can throw away everything but 8 heroes and use those in 1e? There's something like 40-odd heroes for 1e already (including fan-made hero sheets for the few heroes from other Terrinoth games who haven't been migrated officially to Descent.) How many people are going to buy the 2e box set for another 8?
Even if the new monsters are also ported backwards, we already know how new expansion monsters get integrated into old quests - namely, a few new spawn cards that result in those monsters showing up rarely, if ever, in any quests that weren't made with them in mind. People who want to start playing by 2e rules (or think they might want to) don't need 1e versions of the new figures to encourage them to buy - once they have 2e they'll likely just play by 2e rules, at which point the 1e sheets become useless deadweight. People who don't want to upgrade (for whatever reason) aren't going to be tempted by a few more of the things they already have in spades for 1e.
If anything, including 1e sheets for the 2e heroes and/or monsters would just encourage people to try and find other 1e products after having bought 2e - a process which is sure to fill FFG's inbox with cries for reprints of 1e boxes. If FFG wanted to keep printing 1e boxes, they wouldn't have cut off the ones that were already scheduled for reprints after announcing 2e.
Mentioning selfmade heroes: Is there a list of "homebrewed" heroes, which are kind of approved to play. I feel a little bit lost sometimes going to all the homebrew threats to find some decent new character sheets. Often I doubt that they are well balanced. Anybody got a hint?
Not that I'm aware of. Anything made with Antistone's hero generator program is probably pretty solid, though. When it comes to homebrew content, you pick your poison and you take your chances. If it doesn't work out, you tweak it to suit your fancy.
The one thing I would suggest, though, is try playing with the homebrew heroes a couple fo times before deciding if they're really broken. Sometimes heroes tha tlook super strong aren't really so hot in practice, and vice versa.