Hi Steve,
Adding one more point to Kevin's reply, HCPMS is a good option for your mobile apps, where you do not need to bother about the landscape.
HCPMS is the mobile solution on cloud (HCP).
There is a trial available: http://scn.sap.com/community/developer-center/mobility-platform/blog/2014/12/18/how-to-enable-hana-cloud-platform-mobile-services-trial
Regards, Midhun
SAP Technology RIG