It's up in my games. I'm DM'ing two campaigns...
In the first campaign, we had 1 character dead in 4 sessions... and then a (4 player) TPK. Goblins accounted for all those losses. No characters dead in the next session, and then another TPK. Deathjump spiders, that time. We've gone one session since then with no losses, but we're playing again tonight...
In my other (weekend) campaign, we've had 3 dead in 5 sessions. One player has lost two of those, despite being (tactically and optimization-wise) the strongest player at the table. Bad luck.
I think it's a combo of players and DM coming to grips with the rules. They've made a few poor decisions (e.g. not knowing when to retreat, or getting separated), and I've made a few poor decisions (e.g. chucking two deathjump spiders at a 1st level party because their total 350XP seemed "reasonable").
I think as we get more familiar with it all, death counts will probably drop back down to 3e levels... and may end up slightly lower due to the reduction of save-or-die effects and massive critical hits.