Hello Artem.
My understanding is as following:
- If you need HCP (as a platform) then you better with technologies it is supporting out-of-the-box. Today those are Java and XS (JavaScript). More to come, but I cannot share any specific plans here...
- If you need only HANA as a platform then indeed you can host its instance in the public cloud (I am not sure if productive instances are available already in Azure via cal.sap.com...)
Regards,
-Vitaliy