It looks like Microsoft is gearing up for another big Windows Phone event.

The company just sent out invitations for a “backstage” event held in New York on November 7. Microsoft’s Windows Phone team, including Andy Lees and Joe Belfiore, along with other partners will be on hand to discuss the platform.

Interestingly, Microsoft is hinting at a significant announcement.

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“That’s not the only big thing Windows Phone has planned…” the invitation reads.

The event will be held in the New Yorker hotel in midtown Manhattan, with an additional “unique experience” held at Harold Square, which is located right between the Empire State Building and the Macy’s flagship department store.

AT&T will likely also be in attendance, as all three phones displayed on the invite carry its logo.

The invitation comes right after Nokia unveiled its first Windows Phone devices.

Any thoughts on the big announcement? CNET will be there covering the event, so stay tuned.