The 100K invites to the AoE:DE closed beta being sent out next Monday, January 29th, will be the last beta invites sent for AoE:DE before release on February 20th. Source
For everyone who registered as an Age of Empires Insider before last Friday, January 19th, and has not yet received a survey invitation email and completed the survey, the survey must be completed as soon as possible because the team will be picking the 100K invites on Friday, January 26th.
For everyone who registered as an Age of Empires Insider on or after last Friday, January 19th, unfortunately you have missed the cut-off to be invited to the AoE:DE closed beta. You can still pre-order the game to participate in the closed beta until the closed beta ends, which has not yet been announced.
If you have any questions, please ask. I’ll reply to this post with answers from the team on social media and the blog with more information once it becomes available.