Honestly, I think our one and only shot to get a Death Star playset of any sort may be with the 3D release of ANH in what...2015? They've made that cryptic note in one of the Q and A's that the theatrical releases bring about opportunities to try other things they wouldn't normally try, and I could possibly see this being the big holiday item for maybe that year. I mean, they are starting to cover a lot of the big OT offerings already with the Falcon and AT-AT, and I think something like the DS would stand a better shot than an even larger Sandcrawler, Imperial Shuttle, etc. The only other big OT draws I could think of is re-done starfighters (X-Wing, Y-Wing, etc.)
That being said, I do think if we see a DS playset, it is going to be more of a "playset" than a bunch of hallways, etc. that you put together. I just don't see us getting anything like the examples we've seen of customs that look amazing. It is going to be something in the same vein as the Falcon/AT-AT/AT-TE, etc. where it can look pretty nice, but still be fun...and in a way, that's probably how it should be. I could see something along the same line as the LEGO version, where it is a Death Star, sphere-like shape, but has different "rooms" on each side. At least I think LEGO had a version like that within the past few years.