A press release from the IAU regarding the decision to drop Pluto as a planet also mentions there could be many more dwarf planets on the way. Already named as dwarf planets are Pluto, Ceres and 2003 UB313.
"The first members of the "dwarf planet" category are Ceres, Pluto and 2003 UB313 (temporary name). More "dwarf planets" are expected to be announced by the IAU in the coming months and years. Currently a dozen candidate "dwarf planets" are listed on IAU's "dwarf planet" watchlist, which keeps changing as new objects are found and the physics of the existing candidates becomes better known."
The press release says the IAU will be setting up a process to name these objects. Meanwhile, Neptune's status as a planet may also be at risk.
