According to PlayStation’s Turkey Facebook page the PlayStation Vita will be getting a 1.81 firmware update at midnight tonight.
The PlayStation Vita update said to be out tonight, which is rumored and will most likely block VHBL. There has been no official list of the changes the 1.81fw update is said to bring along but given the circumstances of VHBL being out and the fact Sony hasn’t removed Monster Hunter from the PSN points to VHBL getting blocked. It’s highly advised you do not update until it is out if you have VHBL and has been tested to see if it does so. There is no word either on whether this will block PSN to those who do not update.