CBS has announced that they will have a panel at the San Diego Comic-Con called "Star Trek: Celebrating 50 Years". The panel will be in Hall H on Saturday, July 23 from 2pm to 3pm. It will be moderated by new Star Trek showrunner Bryan Fuller with announced stars William Shatner, Scott Bakula, Michael Dorn, Jeri Ryan, and Brent Spiner. Hopefully a video of the panel will appear online since most of us will not be able to watch it. No indications if the panel will be used to announce anything about the TV show but I doubt it.
In addition to the main event above, there will be other Star Trek related panels (as what is a comic convention without em?). Other scheduled panels include a discussion of the Smithsonian's upcoming TV special Building Star Trek, a panel that will showcase behind the scenes pictures and photos from The Original Series, another that will look at the influence of Star Trek on NASA, a panel on the comics and a panel on the Starship Collection. More details on Star Trek at SDCC can be found on StarTrek.com.