As of today for NA Realms, Gnomeregan should have reset and will reset again in 2 days, matching the lockouts of Classic Era's Zul'Gurub, AQ20, and Season of Discovery's Blackfathom Deeps. This was explained previously in a Blue Post.
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Players have noticed there is an issue with Gnomeregan Raid Lockout changing to the new 3-day lockout, where some players were unable to do the current reset. Blizzard is currently investigating the issue and hopefully will have a fix implemented soon.