Main differences between theatrical TPM and Blu-Ray TPM are :

Yoda puppet replaced by CGI
podrace restructured (more racers, more laps, 5 more minutes)
colors fully regraded on a shot-by-shot basis
Digital Noise Reduction and degrain applied to Blu-Ray (trying to conform the original 35mm image to AOTC/ROTS HDCAM look&feel)
missing scene (arrival on Coruscant: from Palpatine’s office to Anakin talking with Jar Jar, was replaced by another taxi scene)
Senate scene : human extras replaced by Aliens
Naboo’s palace : one bridge added on Blu-Ray
CGI effects re-rendered on Blu-Ray
some shots were reframed (to give more wideness), but not all
new 5.1 mix with new sound effects