Since Soul Sacrifice will be releasing soon I was wondering if it is going to be possible to pre-order the game on PSN and still receive all the bonuses (i.e.the 2x Unique Costumes, 3x Magic Items and Japanese VO Pack) that you would get if you preordered a physical copy at a retail store (i.e. ebgames).
Game bonuses are typically connected to the retailer you purchase the game from... In fact it isn't unheard of to have different bonus packs from retailer to retailer for the very same game released... So in short, no you won't receive EB's Soul Survival early reservation bonus if you you purchase your game from the PS Store...
The only exception is if you purchase a digital download from EB, I.e. paying EB in full for the digital Soul Sacrifice download which you can do... Then you could get a code for the EB bonus content... This is a question you would have to ask them... In this digital purchase scenario you would pay EB for the game to be downloaded over the PS Store...
They already confirmed that Soul Sacrifice will NOT have retailer-specific pre-order bonuses. The listed bonuses are available everywhere. The only thing they didn't mention was whether digital copies will have the same bonuses, which is what the OP is asking.
I had not heard that re: specific to Soul Sacrifice...
Check out the reply to comment #10: http://blog.us.playstation.com/2013/01/29/soul-sac
Also, in that thread, you'll see that #8 asks the same thing as this thread and the reply to that was that they'd have more information for us on it, which I haven't seen posted yet.