Ratskinner
Adventurer
I do not like rolling HD. It does little more than allow random generation to gimp an otherwise good design. Where's the benefit to a fighter with 1 hp? Even with a good con thats oh...3, 4?
While I do feel that 4e started off characters too high, I feel that a random HD+con at lvl1 is far too low.
I suspect (from a hodgepodge of things from various places) that we will see that you get max hp whenever you level up. The randomized recovery of HD during play will act to make it interesting. This would also fit with the idea that games wishing to start with competent/heroic PCs a la 4e would start at level 3 or so, rather than level 1.
I'm not sure how Con or Con bonus fit into the scheme (if at all.)