HuffPost says it'll be Kasich/Rubio.
http://www.huffingtonpost.com/seth-abramson/john-kasich-will-be-the-r_b_9638598.html
A
Kasich/Rubio ticket would appeal to both mainstream Republicans (Kasich) and Tea Partiers (Rubio), to both white and Latino voters, to younger voters who want to see someone relatively young on the ticket, to those looking for a ticket whose members run the gamut from executive to legislative experience at both the state and federal levels, and to those who believe all members of a presidential ticket should hail from a major battleground state.
If all of the above occurs, as the conventional wisdom seems to now suggest it will, and the Democrats nominate Hillary Clinton, she’ll begin the general election campaign down by double-digits to a man she hasn’t polled well against for eight months or more — basically since the beginning of the 2016 race