The projectors upscale existing content, but won't accept 4K sources if you happen to have them.
Manufacturers are not messing around – they want 4K to be the new hotness and they're not afraid to push out products like crazy. We've already seen a few huge televisions and JVC is filling in the other side of things with their 4K projectors.
There's a wide range of projector models available, but most notable are the X55R and RS48, which give you 4K upscaling at $4,999 – significantly cheaper than any of the TVs coming to the market. In fact, the X95R/RS66, which gives you ISF calibration, an upgraded light engine and pending THX 3D certification will run you $11,999. All of JVC's new projectors will be available in November.
JVC says that they have 84 inch monitors on the way too – one for business and the other for home theater. The RS-840 home theater model gives you 10 bit color depth, ELED illumination and a slim bezel. Availability is expected in January of 2013 and the price is set for under $20,000.