WildStar announced the second wave of December beta invites

According to CRB_Cougar, WildStar fans can expect the second wave of Stress Test beta invites for this weekend. While you’re waiting for a beta key, additional details addressing this topic unveil that this wave will be slightly larger than a previous one.

Confirmed.
This is also not the only type of key going out this week.

CRB_Cougar posted after the first wave of December beta invites the following information:

In the near term; a Winter Beta stress test wave and one more wave (slightly larger than tonight’s wave). Beyond that, plans can/will change.

I suspect you’ll start to see some partner beta keys start to show up too (don’t hold me to any timing here though, as I know we are TALKING to partners but I don’t know that we’ve finalized anything yet along these lines)