So browsing the web, I found out about this up and coming game from FFG and was surprised to see that there wasn't a thread about it on BOLS. (I searched, if I missed it then I'm sorry :V).
here's the short form:
-Play as a guardsman, one of twelve classes. (tech priest, priest storm trooper and sergeant confirmed)



Only War is a standalone Warhammer 40,000 roleplaying game experience in which players take on the roles of soldiers in the Imperial Guard, the galaxy-spanning armies of the God-Emperor. Fully compatible with FFG’s other Warhammer 40,000 Roleplay titles, this comprehensive game system explores a previously unseen side of life in the Imperium of Man.

Join the ranks of brave men and women inducted into the God-Emperor’s armies, trained to fight and sent off to far flung stars and systems to hold the line against the coming night. Despite overwhelming opposition, or perhaps because of it, these fearless soldiers are bound to each other by a code of brotherhood and honour. They are the thin line that protects the Imperium from complete and utter destruction. They are the Imperial Guard.
[URL]http://www.fantasyflightgames.com/edge_minisite.asp?eidm=201&enmi=Only%20War[/URL]

[URL]http://www.fantasyflightgames.com/edge_news.asp?eidn=3185[/URL]

Take the role of a Guardsman with one of twelve distinct Specialties, offering unique skills to your squad to complement those of your comrades. Will you bring the light of the God-Emperor to the battlefield as a Ministorum Priest, or will you wield the Imperium’s most cutting-edge technology as a fearsome Storm Trooper? Perhaps you’ll tend to the machine spirits of the Guard’s many war machines as a Tech-Priest Enginseer, or lead the charge as your squad’s Sergeant. Whatever your function, you’ll be a vital part of the Imperium’s vast war machine.
I'm excited, will probably buy it once it's out, I'll have to grab my friend who's into 40k and rpg's then bring it to the hobby shop and figure out a group.