Invite only till at least autumn, and they have no English speaking support (it is for their Chinese only DCs.)
Google Alibaba China F1 or F2.
As for the offering, the idea is that end the clients will only have to deal with SDK and libs on instances, not raw RDMA or anything related to internal infrastructure. This is how much I am allowed to say besides the fact of its existence.
From their current experience, and that of other hosting providers, not many people who go with F1, F2, or other FPGA instance actually do reap any benefit, and some drop mid-way. That's why they want to get more people using them pass the "toying with it stage." The "Herokuification" (god, Heroku sounds beyond hilarious in Russian) is there to let people use the common APIs while getting benefit from FPGA performance, without dealing with things outside of average webdev area of expertise.