EP3 is not available yet. You should just hold off on putting in the time. I believe saves are going to be compatible but I'm not 100% on this. I think it was stated that your current saves would carry over with the patch. So you could beat EP2 and wait for EP3 and use your save.
Thx for the info! - Sorry to bother with N00b questions but is there a thread here where I can best keep up to date with this matter? (Browsed through the forums but didn't found anything...)
(Or is the 'Despair and Hope' Mod EP3?!)