Sprint is already planning to release a Wi-Fi enabled update to the BlackBerry Tour, in a move that mirrors the carrier’s strategy shift toward requiring Wi-Fi for all its devices, according to reports.

The BlackBerry Tour goes on sale Sunday at Sprint and Verizon for $199.99, and supports both CDMA and GSM networks. But since Research In Motion officially announced the Tour several weeks ago, reviewers balked at yet another BlackBerry lacking Wi-Fi.

To remedy the situation, Sprint next year will offer an updated Tour sporting Wi-Fi, though no other details were provided, according to FierceWireless.

“It is now a requirement for all our PDA equipment suppliers to include Wi-Fi,” said Jeff Clemow, the carrier’s director of business product marketing, according to FierceWireless. “Several quarters ago we made a conscious decision to require all of our PDA suppliers to support Wi-Fi.”

However, Clemow said the carrier has not set a specific date for its suppliers for the inclusion of Wi-Fi.

Meanwhile, RIM is remaining cagey about details of the so-called Storm 2, which is expected to have Wi-Fi and to debut by fall from Verizon. Though it received mixed reviews, the original Storm, which lacked Wi-Fi, was seen as the BlackBerry makers’ answer to the Apple iPhone 3G, and was the first RIM handset with a touchscreen. And despite the tepid critical response to the Storm, RIM said the device is key to its efforts to reach non-business users.

Also just out from T-Mobile and AT&T is the new Wi-Fi enabled BlackBerry Curve 8900.