It should be out very soon. We'll annouce in the forums when it is posted public.
It seems that the help has already been made available so I would suggest to read the What's New for now.
2015 has been working really well for me in Beta so I am looking forward to using more and once it is available I would suggest for most users to upgrade. For the few out there, SpaceClaim launcher is back!
Just saw that download is available today. Cannot wait to try it out. The simplified heat sink model seems interesting because I have to deal with heat sink a lot. Hopefully, it will do well for me. And hopefully, there will be tutorial on how to do this.
Had there been any improvement in 2015 regarding the cluster integration? 2014 version had a bug in which when logged in (through remote desktop) to the cluster, we couldn't submit the jobs as the error about UNC path was reported, even if the simulation files were opened from UNC path. Hence we haven't even migrated to 2014 and use 2013 for most of our cases!