I know "Horde mode" could be pretty straight forward in interpretation - you go in some place and fight a lot of enemies but will it be 4 players or more? Will it be tyranid only or chaos only? It will be in Operations section or we will get whole new mode of game? If it will be new game mode, characters leveled up in OPS will be usable on lvl we got there in this Horde mode?

Will there be any rewards for completing this Horde mode? Will it even be possible to complete it or just hold as long as you can?

Yesterday I finished Bolgun and played Horde mode that we can find there. To be honest it made me a bit worried about Horde mode that is said to come to SM 2. Horde mode in Boltgun is really just one small arena where you get flooded with enemies. After you complete it you get nothing. I played it once and the moment I did it I already knew I won't be playing it again ever in my life. There is no reason to do so, playing it felt like a duty you complete to serve the Emperor but you are not proud or happy about it. Like inspecting thunderhawk on flag ship when there is battle going on on the planets surface below your feet. You feel weird, you feel ashamed and you completly understand you waste time. 

I know Boltgun is completly different game and that's why I made this thread. Are there any news anywhere about this mode? What it will look like or anything?

I do realize we are far from it but I would like to know in advance if there is anything to be excited about instead of getting dissapointed later. 

I will even create a POLL.