McDonald's is testing Frozen Strawberry Lemonade as a possible McCafe offering. According to Advertising Age, the frozen drink is being tested in a few markets here and there, including Michigan and Austin, TX.
Seemingly most similar to Taco Bell's Frutista Freeze, the drink appears to be an icy slush of lemonade with a swirl of strawberry sauce or syrup. Frozen Strawberry Lemonade are made with the same machines as Smoothies and Frappes and, my guess is they might be priced the same as well. That would be $2.29 for a 12-ounce small, $2.79 for a 16-ounce medium, and $3.29 for a 22-ounce large.