So far the Epic Spellplague Caverns is the only dungeon i'm aware of that is not working with Epic dungeon keys.
The chest does not get unlocked, even upon entering the dungeon.
We found the same issue in SP epic...as well as a couple of us walking into regular just to see what was happening (6 times in all). Made sure we had DD key, epic keys and regular dungeon keys and were not in it during the DD hour. In most runs one person got the chest while everyone else did not. In epics everyone got a drop, no end roll (which was actually pretty profitable... shard, 1 or 2 BoE epics each and a greater mark. The dungeon never burned our keys and I personally never got the "chest unlocked" banner on entry. One of our group got the chest though without a banner and some only got the banner up when we entered last boss, so who knows what's up there. Bottom line is IMHO, you're rolling dice on time spent if you're counting on the chest in SP for gear until it's fixed, but if you're not actively looking for a new hat then the last drops to all 5 in group are pretty farmable.
Yup, first run after patch during DD hour we all got the end chest...ran it again later with keys and 1 person got the chest, everyone else got nothing. Still broken.
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Well, we got a bound epic each, plus one unbound.