What's Mitsubishi going to concentrate on now that their projection business is out?

They only exited the RPTV business. They're still making projectors.

The only articles I can find mention them leaving the DLP business, does that mean they will continue with the LaserVue?

It's a shame that more stores don't carry the LaserVue sets. I'd like to consider one, but the only one I've ever been able to see in person is the first generation, and I hear the later ones are much better, especially since they started adding the glossy screen cover (being able to see the texture on the fresnel screen was a major turn off for me in the first-gen set).

Also a shame no one makes CRT based RPTVs anymore. Yes they were huge, but hard to beat from a price/performance standpoint. The obsession with thin displays at the expense of image quality is one of the biggest problems in the industry.