The fish version of Chicken McBites was tested around this time last year in select markets and did well enough to warrant a national launch.
The dish features breaded, bite-sized pieces of Alaskan Pollock and comes with tartar sauce for dipping.
Prices (may vary) are: $2.29 for a "snack" size, $3.39 for a "regular" size, and $5.49 for a "shareable" size. They'll also be available as part of a Happy Meal later on in the month for $4.19 (may vary).
Update 2/12/13: It looks like in most markets, the $1 Snack Size promotion is only good from 2/12 - 2/14.
Nutritional Info - McDonald's Fish McBites - Snack Size - 3.4 oz (98g)
Calories - 250 (from Fat - 80)
Fat - 13g (Saturated Fat - 2g)
Sodium - 420mg
Carbs - 21g (Sugar - 0g)
Protein - 11g