Through the exertion of some gentle pressure on the University of Hawaii publishers, the sequels to James Heisig and Timothy Richardson's publication Remembering Hanzi 1 have just been made available for pre-order. Expected date of publication is end of May 2012.
Here are the details:
Remembering Simplified Hanzi 2: How Not to Forget the Meaning and Writing of Chinese Characters
http://www.uhpress.hawaii.edu/p-8750-9780824836559.aspx
ISBN 978-0-8248-3655-9 - $29
Remembering Traditional Hanzi 2: How Not to Forget the Meaning and Writing of Chinese Characters
http://www.uhpress.hawaii.edu/p-8751-9780824836566.aspx
ISBN 978-0-8248-3656-6 - $29