Terribly sorry to here about the Mrs.; That being said, to break the lease it may not be too bad financially but you would have to negotiate a hell of deal at Cadillac and hope for some discounts and incentives. Case in point, I was very unhappy with the 128i I leased that admittedly was my fault (automatic & not sport package). I put up with it for about a year until I just couldn't take all that it wasn't. So I walked into a Merc dealer and because of CarQuest and the '12s on the lot (my car being a left over 2011) they were willing to move it at an incredible deal. I broke my lease 13 months in, got a shorter lease (36 vs 33) and about $40 cheaper per month.
Long-winded I know, but bottom line, search for a '12 cts-v at a Cadillac dealer now that '13s are moving and push for all the incentives that are out there.
Good luck to you and your wife, I hope it all works out.
'13 Audi S4||'14 Mercedes-Bez E350||'11 Mercedes-Benz C350||'11 128i E82||'06 325i E90||'02 325ci