I agree "confirmed" is too much. However, it isn't completely unrealistic to assume this teaser was developed together with the eventual new Model X site, if launch is nearby. Hence it also would be possible they would have removed the 60 kWh mentions etc. if they were unsure and/or about to remove them.
I haven't seen any reason to believe 60 kWh Model X won't come, no matter how popular that belief is on TMC. I guess the only reason to suggest it would be gone is that there is no AWD 60 kWh Model S and that Tesla's 200+ mile baseline might be threatened with an AWD 60 kWh Model X, but that is just speculation.
I'm leaning on there being a 60 kWh Model X and this update being further confirmation of that, but I agree it is not a complete confirmation because there is still the chance the web team is in the dark.