Scratch

Great questions! I'd love to answer them all, but I don't know the answers, so I'll just tell you the best of my guesses.

colorfusion wrote:

Will all old projects still work?

My guess would be "yes," and if not, I'm sure you can still use 1.4. However, all previous versions of Scratch have been backwards-compatible (mostly), so I would expect old projects will still work. However, because there's a complete rewrite, I'm not entirely sure, so don't take my word for it.

Will projects save as flash files as-well as upload as it?

I doubt the projects will save as Flash files - they'll probably use the old .sb format. But the online player will definitely be Flash-based, so they'll probably have something to embed it which will give the illusion that the project is running as a Flash file.

Will we be able to open other flash files in scratch?

I highly doubt that - Scratch won't be a Flash file creator (that's what Flash is for!), it will be a programming tool made in Flash. They're completely irrelevant.

Will many new blocks come out?

That would be my guess