Looks awesome with tons of new features!
There's a flash demo...
http://www.roxio.com/en/products/toast/product_demo.jhtml
and a pdf...
http://docs.roxio.com/en/toast/toast6_datasheet.pdf
It finally includes SVCD encoding and creation tools (chapters, buttons etc) as well as VCD and DVD, something long overdue on the Mac.
Plug & Burn for video - finally - direct recording and encoding to disc from a DV camera! Still a bit unsure of the details, encoding, formats allowed but it looks like Roxio is really going with the "digital hub" concept.
Encryption of CDs and DVDs! Previously I have had to create an encrypted disc and burn that to the CD. I couldn't encrypt the CD itself.
All sorts of other features look good. The new effects for Photos (cross fades, pan and zoom etc), the rendezvous networking, automatic back up, compression of data (up to 50%), burning directly from the Finder.
All in all, sort of a cross between iLife and Disc Burner with added features, in some ways better.
I'd be interested to see what it's cue/bin and overburning support are. For that, I currently use Firestarter FX.