Does the XP-30 have velocity switching? (That's when for example, you assign two layers to appropriate velocity ranges, playing the keyboard gently produces the fingered sound, playing harder produces another sound).
and
Does it have splits?

Yes, the Roland XP-30 does have a split capability. Here are the specifications I got from the roland site in Canada:

The XP-30 brings together the world-renowned sound sets of the acclaimed JV-1080 and JV-2080 synth modules, all the Patches from
the Session, Orchestral, and Techno Collection expansion boards, plus two additional expansion board slots.

Powerful performance features of the XP-30 include the innovative XP-60/80 Arpeggiator, built-in reverb/chorus/effects, four programmable sliders for realtime sound control and editing and Patch Finder and Phrase Preview functions borrowed from the JV-2080. A built-in SmartMedia™ storage slot allows additional storage of Patches and Performances on optional 2MB and 4MB SmartMedia™ cards.

The XP-30's weighted 61-key, velocity/aftertouch sensitive keyboard
offers great playability, while its illuminated buttons and user-friendly operational layout increases functionality and ease-of-use in virtually any environment.

Roland XP-30 Specifications:
Keyboard: 61 keys, Velocity, After touch
Parts: 16 part multitimbral
Max.Polyphony: 64
Internal Sounds: Preset Patches 1,406 --
User Patches 128
Drum Sets: 28 (Preset 26/User 2)
Wave ROM Standard: 64 Mbytes equivalent
Max. 96 M bytes equivalent (SR-JV80 x 2)
Arpeggiator: 33
Effects: Chorus, Reverb, Multi Effects (40 types)
Controllers Front: Pitch/Mod Lever, 4 Sliders
Rear: Hold Pedal, Assignable Switch Serial port: PC I/F
External Storage SmartMedia™
Dimensions: 1011 x 289 x 88 mm
Weight: 7.8 kg