how is the denon 'too old' ? its a current model just got released in the last year. infact I'd go as far as say even denons from 3-4 years ago in the denon 3808 ad 4308 are very very good.
ps I wouldnt get too carried away by airplay or anything. a $129 apple tv will give you more functionality that can add to any avr 
From what i've heard and read (don't quote me because i'm not an expert) but the reason this was said was due to to Denon releasing a new amp in the lower (not made in Japan) amps eg. the 3312, 2312.
Denon didnt release an update for the 43 series (4312) due to the ongoing power issues in Japan. Denon as supposedly skipping the 4312 and releasing the 4313 toward the end of the year.
The guy at the hifi store said it was getting on now because it's missing some features that the newer amps now have, i believe the Pioneer LX75 and 85 were released in the 2nd half of 2011 and the Denon around a year before that.
I already have 2 Apple TV's but i really want the amp to do that too so i dont have to have the Apple TV's running all the time.
I like Denon's incorporation of DSX and updated MultiEQ XT32.
But it's internal power amps aren't as well implemented as the ICE modules in Pioneer's top AVRs. They don't deliver the rated power when all channels are driven.
If you are using external power amps to offload at least the front 2 channels, the Denon should be comparable. And that's where audyssey SubEQ and XT32 becomes a bigger factor.
I'd love to go down this path (external power amp) but unfortunately i dont have room in my entertainment unit and i dont have room for a rack.
Righto boys, take it easy. Back to the OPs' question though - The 4311's feature set is still current, so the only issue is pioneers' ice power modules over denons' class a/b amps.
Emerson - if you just want big dynamics for movies, the pioneer might have the edge, depending on your speakers. As doggie has pointed out the class d amps in the pioneer are more efficient and generally work very well in home theatre setups. The denon will probably sound better with straight music playback given the classic amp design.
I wouldn't worry too much about all the chatter regarding outsourcing channels to another amp unless you are running large difficult to drive speakers in a generously proportioned room. These avrs are a major step forward for most people and have sufficient power for all but the most ardent cinephiles.
I'm using a 5.1 set of Paradigm SE's, i don't believe that are that power hungry.
Thanks again for the advice Caeser