It all depends on the meaning of "backwards compatible". Does it mean #bgee saves can be played in original Baldur's Gate game client? Or ... across older versions on a different hardware device? Or, you can play the save of an old Baldur's Gate game in the new #bgee client? Or all of the above?
Since they are using the BG2 engine you will not be able to use saved games from BG1in BGEE, other than maybe importing a character, as you can with BG2 today. You will also not be able to use a BGEE saved game with BG1. Overall, I wouldn't expect much portability between the old editions and the EEs, other than importing characters.
Well the Tutu saves were no different from non-Tutu ones, if my memory serves, and Tutu was BG2 engine. What will make it more troublesome is the difference in scripts with all these add-ons, an old save would bug out, like when you mis-installed a mod and loaded a save, and then four hours in find out your uber quest was unfinishable due to an NPC not being there or something... I'm no programmer but if the engine is still Infinity, the saves should load... how well you can play them after that is probably where it won't work. Hmm I'll try loading a BG game on IWD just for kicks!
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Correct me if im wrong.
So i'm interested too on that subject, i have got a few started saves too ;-)