After making a strong impression in the second season premiere of CBS' "Elementary," actor Rhys Ifans will return as Sherlock's brother Mycroft Holmes in further episodes this season.
The character will be coming to New York according to creator/producer Robert Doherty who appeared over the weekend at the New York PaleyFest.
Mycroft is expected to have four appearances in the second half of the season, and a will appear a "couple more times" in the first half.
Natalie Dormer's Irene Adler character is expected to re-appear "around midseason". They want, but haven't signed Sean Pertwee on yet for further appearances as Inspector Lestrade.
Source: The Wall Street Journal