What payment processors will be supported in core for 4.7?
Omnipay should work with the latest version - but is only relevant if a processor you wish to use is currently offered through it.

If you want recurring in the US you should probably consider
IATS
Paypal
Authorize.net

in that order. 

IATS is most actively developed &amp; IATS has been investing in Civi development itself &amp; the other 2 have the most traction - although Authorize.net has some real technical gaps - ie. they don't retry IPNS.

If you do go with IATS you should use their customer referral programme as your customer will save $100 that way. IATS will also either give you $100 or donate it to CiviCRM if you (like us) prefer not that in order to maintain neutrality http://home.iatspayments.com/civicrm-referral