"something custom for TPU" is what seems interesting here. Researchers working on the TF research cloud probably wouldn't learn much about the sorts of workload

"something custom for TPU" is what seems interesting here. Researchers working on the TF research cloud probably wouldn't learn much about the sorts of workloads this architecture is suited to, if all they have access to is the high-level API. Would whatever iteration of the TPU API they have internally be something they'd release soon, at least to partners?