From the always interesting wtf1.co.uk:
Good news (for some), it seems like the Autodromo Hermanos Rodriguez in Mexico City is returning to the F1 calendar in 2015. The bad news? It looks like they're going to butcher the awesome "Peraltada" curve. The new layout is likely to go through the middle of the baseball and concert stadium "Foro Sol" to use the extra stands.
This track render on rFactor shows what it might look like.
Personally, I think it's quite dull. Tracks with no elevation are the least interesting, and this circuit looks like they combined the most boring parts from the Abu Dhabi and Korean tracks. Hopefully they'll force the drivers to take a shot of tequila during each pit stop, therefore giving Kimi an instant win.