Arizona debacle, and the started to see a similar process in New York.

This raises another question...why DIDN'T the campaign challenge the early re-registration cut-off in court, and challenge it back in September? It's hard to believe they didn't know it was an issue.

Election Justice USA did: https://www.facebook.com/ElectionJusticeUSA/

It's worth noting that there are confirmed anti-Bernie operatives who have infiltrated Bernie's campaign.
It's possible that there is an effort to keep the campaign from launching a lawsuit over this.

I wonder if the ludicrous timing is actually some sort of an infiltrator effort to submarine us?

Given how horrifically ugly this campaign has become, that would not be surprising.

Any idea how many potential voters this may affect?

Hopefully, the Sanders campaign is buying ads in NY advising potential voters of this.