I've been convinced that this is ZE related since day one and nothing we've found over those 3+ months has changed my mind. If you go through the OP and try to look at things as objectively as possible (starts at 0303, nearly 4 month long teaser, ends in a fan-panel that will be live-streamed, RSG/Aksys/Uchikoshi hints, context from old interviews/FB posts, etc.), it's still the most reasonable assumption if ZE3, Punchline and the Infinity series are the available options.
There's always been a chance that the whole teaser was deliberately done in a way that all ZE fans would be excited for the announcement of something else, but the only thing I can think of that would be worth the trouble is a spiritual successor to the ZE series with Uchikoshi involvement (he still works for Spike-Chunsoft, so I'm not sure that is even possible).
I feel like we have a very strong case for this being ZE3 the game or ZE3 the kickstarter. A re-release of the Infinity series is still a possibility, but the rights situation is a mess and nothing points at it except for the url, so imo it’s less likely and I’m not sure if a practically unknown franchise warrants a 4 month long teaser. Friday can’t come soon enough.