Yeah, I wouldn't count on them doing anything too radical or original. For one; It's E.A. They make their money churning out clones of whatever makes the most money.
There's no point to a prequel, what's the point of playing as a Prothean (for example) fighting for their survival when you know they are going to lose? Setting it after ME3 means they would have to set down Shepard's gender, alignment and who he/she was supposed to end up with (romantically). And if the Mass Effect forums are any indicator, well, the fan base would be considerably reduced, which means less sales.
I'd say a "What If..." parallel universe storyline or Synthetics decide to conquer known space. Synthetics ruling the galaxy could allow them to potentially avoid the idea of having to set down Shepard's canon.
There's no point to a prequel, what's the point of playing as a Prothean (for example) fighting for their survival when you know they are going to lose? Setting it after ME3 means they would have to set down Shepard's gender, alignment and who he/she was supposed to end up with (romantically). And if the Mass Effect forums are any indicator, well, the fan base would be considerably reduced, which means less sales.
I'd say a "What If..." parallel universe storyline or Synthetics decide to conquer known space. Synthetics ruling the galaxy could allow them to potentially avoid the idea of having to set down Shepard's canon.