Frankly, I don't think that's a bad thing. I don't think there's been any significant enough advances in technology to warrant a new model right now. Just look at JVC, all they did this year was slap FI on last years models.
There's some promise out there for major advances in DLP technology, but they're not ready for a 8150-type price point yet. There's been talk of new DMDs, and there's LED illumination, but neither are ready now (LED judging by the Vivitek price/performance). Basically I don't think a new model would really bring anything to the table as of today.
Let's hope Planar is working on a locally lit LED machine, maybe with a new DMD for next CEDIA. Now that would be worth releasing
And I think I may well enjoy my Planar more every time I sit down in front of it. I watched the first disc of Torchwood: Children of Earth last night, and man this Planar is gorgeous