Gollancz's reprints of the first three Wild Cards books and the more recent ones seems to have been quite successful, as they will be reprinting further books in the series in 2014.
At the moment, the plan seems to be release the books on the following schedule:
Aces Abroad (Wild Cards #4): 8 May
Down and Dirty (#5): 12 June
Ace in the Hole (#6): 10 July
Dead Man's Hand (#7): 14 August
Lowball (#22): 11 December
Wild Cards (#1), Aces High (#2), Jokers Wild (#3), Inside Straight (#18), Busted Flush (#19), Suicide Kings (#20) and Fort Freak (#21) are already available in the UK. The books from Inside Straight onwards establish a 'next generation' kind of setting mostly focusing on new characters with familiarity with the earlier books not assumed, however completists will no doubt be pleased to learn that they will be able to read more of the series in order by the end of next year.