No, it won't be table-top Darkraven.  But part of what makes XCOM [i]XCOM[/i] is the choice between choosing to fire or not, and getting frustrated and throwing the controller at the screen because one of your greatest soldiers just got killed.

I'm not a fan of a system either, but I might still use some sort of free-form system.  I'll decide whether or not you make your shot, and I'll decide whether or not you get flanked and killed.  It'll be harsh, but oh well.  This is XCOM, right?