Play-Nintendo is reporting that we can expect to see the full version of the Opera Internet Channel as soon as late March/early April, which was revealed during an interview with Berit, an Opera employee.

They also revealed a few more interesting points, such as the Browser being updated regularly and the possibility of keyboard support. They could not answer many of the questions asked though, due to being under an NDA with Nintendo.
A keyboard would make writing text on the Wii a whole lot easier, and it is an accessory that would probably be bought by a lot of Wii owners who are serious about using their Wii as a Message Board and Internet Browser.