The general policy is "Until 4J Studios posts their 'Light the beacons!!!!!!!' post on Twitter, confirming it's gone into Microsoft Certification, they don't give even a hint to what month the update will release, let alone a date.".
There has been no "It's in MSC." post on Twitter, or elsewhere, so don't get yourself bothered with hoping it'll be soon. Given that they're showing skin previews for the Skin Pack #4 (technically the seventh, seeing as they never numbered the "Summer of Arcade", "Halloween Charity Pack" or "Christmas Pack" releases) now, I'd say the TU9 update will be this month for sure... possibly in three weeks. So "26th March" seems about right, if we're guessing dates.
As a "Tuesday", it fits their usual release day of the week... though, given that 18th March ~would~ fit into a "ten days in certification, plus 4J Studio's 'Whoops! We need to fix this first!!!' time frame, it could be then, as well. But I wouldn't expect it on the 11th, for obvious reasons.