If you look at Page 3 of PC Gamers' 2009 Holiday Edition you will see that Antec placed a full page Advertisement on the Antec 600. And I got to say it looks REALLY NICE. Surprisingly they have not posted pictures of it on their website yet. To me the Antec 600 appears that it is going to replace the Antec 300. They are about the same size however the 600 looks a whole lot more stylish. I think it is neat that they put a sunroof on the top of the case.
Here are my predictions:
It appears that Cooler Master may be discontinuing the ATCS 840 Cases. If you notice Newegg, Tiger Direct and other sites have discontinued the silver version and only the black Version is remaining.
See here where Newegg Deactivated the Silver ATCS840:
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119186&cm_re=N82E16811119186-_-11-119-186-_-Product
The year 2010 is coming.
My prediction is that Cooler Master will come out with a Stacker 850 case or an ATCS850 case to replace the 840 that will have numerous refinements that will likely include a black interior. It will also replace the Aging Stacker 830 which is in need of 2 or 3 years worth of improvements.
I believe the Antec 1200 came out in January of 2009. My guess is that Antec is making a Full Tower gaming case that will likely be named the Antec 1500 (or less likely the Antec 1202 or 1300) that should debut Jan 2010. I am thinking that it will look a lot like the Antec 600 but be much bigger with cable management holes, and a black interior just like the 902 and 1200.
I believe the ATCS840 came out in January of 2009 also. This would make a lot of sense because both companies (Antec & CM) would release full towers the same month to go head to head with each other. Or maybe there is no marketing strategy and they are just going to release the 2010 cases in the first month of 2010.
I also expect that CM will add a new case to the CM Storm line up not as a replacement but a new model all together.
It may be worth holding off on a case until Feb 2010 to see what the new year brings. These thoughts are just purely speculation backed with no facts but I think some of what predict will likely happen.