My armchair imagineering suggestions for the space they have left, based on the map below, would be as follows:
Most of the space is in Adventureland. I would split this into two halves, one with an Caribbean theme and the other with an Indian theme.
The Caribbean half would include Pirates and Haunted Mansion. Pirates could be similar to the one in Paris, or alternately the rumoured Splash Mountain hybrid. HM with Caribbean theming would be unique to HKDL.
The Indian half would have an Indy ride (a proper Indy, not just a coaster) and Everest.
There looks to be room for only one more ride in Tomorrowland (unless they found a way to incorporate the land between the Golden Mickeys and Autopia). The former plot (between Buzz and Autopia) isn't very big, so the revamped Star Tours might be a good fit. If two rides can be built, using the plot between Golden Mickeys and Autopia, then maybe something based on either the test track or kuka arm technology could be considered (the latter after expiration of Universal's exclusive rights around 2015).
For Fantasyland, aside from relatively small dark rides like Little Mermaid and Peter Pan, there looks to me to be room for maybe a couple more large attractions. If up to me one of these would be a ride even little ones could enjoy...like the Fantasia boat ride planned for Beastlie Kingdomme. The other would a be thrill ride...perhaps Dragon Tower (also from Beastlie Kingdomme) or Splash Mountain (depending on what they did with Pirates).

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