Apple has been offering the same basic Cinema Displays for a number of years now with nothing more than slight spec updates. According to rumors that may well change in early 2009 at MacWorld 2009 with a total refresh across the line.
Apple is said to be refreshing the line of Cinema Displays that are currently offered in 20-inch, 23-inch, and 30-inch sizes. There are no hard details on what the update would entail at this time.
However, it would not be much of a stretch to see the line go to LED backlighting. I could also see the displays gaining more inputs, possibly even a DisplayPort. Pricing will be expensive considering that the current models sell for £399, £599, and £1,199 for the 20-inch, 23-inch, and 30-inch sizes respectively.