I would not say it's better. Hybrid Crossfire looks good to boost very casual gaming (Spore supposedly will run at 30 fps capped on a 780G alone), but even a 3650 or 8600 is a better deal.
That said, I like IGP's on my boards just for the option of extra monitors or ease in setting up the system. I once had to RMA a card in the 7600gs generation and used an Nvidia 6100 for the turn around time.
The 4650's are coming out on September 10th. Compare them to Nvidia's 9500 and see which one works for you. If you're going 780G board, I'd go 4650, or even a cheap 3850 for the best bang for the buck right now.
That I didn't know. I'll have to look for those tests. Generation wise, I'd have expected a 4650 to equal a 3850 in power but be DX10.1. That's because the 4850 outperforms it's older sibling and I'd expected to see similar boosts in performance at the low end.
Sigh, I guess they're aiming the 4650, like the 3650, at the HTPC market. I'd read about a new AIW card and hoped it would be a 3850, but rumors say it will be 3650 (haven't checked to see if it's out yet).