There, I found the text where they said they were going to add splitscreen and coop:
From Kickstarter last update.
Hi there Kickstarter Carmafans, nobby here!
Well, all good things must come to an end, and so it is with this AMAZING month we've shared with you all. We've had some laughs, we've had some hooters and some bloopers, we've had some kitteh arm humping, and we've ALL had such a BLAST feeling the love from the Kickstarter community that's supported us throughout the Campaign.
THANK YOU, YOU MARVELLOUS BAND OF CARMAFANS!
We're still confident that YOU'LL get us across the Stretch Goal Line... But REMEMBER: If for any reason we don't quite make it (but we WILL, we WILL!), DON'T DESPAIR!! We won't let you down, and we WILL STILL be incorporating ALL those features that we've stated are Stretch Goals. We will still support:
It will just take us a little longer to deliver them to you! (Although it won't, as we're GOING TO MAKE IT!!) :D