From Blu-ray.com:
BDA: Decision on 4K Discs Coming Up
April 27, 2013
The Blu-ray Disc Association (BDA) has confirmed that it is considering format extensions that could enable 4K content playback on Blu-ray. The confirmation was issued in a statement which was sent to CNET.
To enable 4K content playback on Blu-ray, the BDA members will have to agree on new codecs and resolution limits, amongst other things.
A final recommendation on the future of 4K Blu-ray is expected later this year.
Here's the statement the BDA sent to CNET:
"As part of its ongoing responsibility to maintain Blu-ray Disc as the premium platform for watching movies and other content at home, the BDA established a task force last year to study a range of possible format extensions, including those that potentially enable 4K content playback on Blu-ray.
Through the first quarter of this year, the task force solicited and received numerous proposals, and is now evaluating the various technologies.
The task force, which is comprised of representatives from BDA member studios, consumer electronics manufacturers and media technology companies, looks forward to sharing with and receiving input from content creators, and is expected to make specification and technology recommendations to the Blu-ray Disc Association board of directors later this year."