Jesse Barnes had initiated the RandR 1.3 discussion this week by proposing two additions that would reduce mode-setting flickers and an output property method that would allow other properties to stay up-to-date with events that bypass the driver (i.e. back-light changes from hot-key events). Alex Deucher had then proposed an additional level of abstraction for encoders and connectors, rather than just outputs. Other items brought up by developers include exposing the i2c bus in RandR, support for monitor calibration controls, and multi-card support. Read more on the X.Org mailing list.
RandR 1.3 is targeted for X Server 1.5 / X.Org 7.4, but it could be delayed (v1.5 has already lost the "input hotness"). The X Server 1.5 release is planned for March of this year, but a delay is expected. For more on the current capabilities of RandR, check out our newbie's guide to RandR 1.2.