Also, it's missing ACOS.
Technically not an album - it's an EP, so the list in the OP is just including LPs/full studio albums.
If anything, I'd say the Odd albums lean towards more heavier, darker, metal material while the Even albums are a bit more melodic, harmonic and proggier, but those are BROAD generalizations, although sometimes, comparing each pair, it becomes a bit more apparent:
WDADU to IAW, the latter was definitely proggier and a bit more melodic, definitely a bit poppier too (see any shorter song)
Awake to FII, it went from heavier and a bit experimental to shorter songs with more focus on melody
SFAM to SDOIT, while the former was proggy in that it's a concept album, the latter is longer and has more of that classic prog-album feel to it
TOT to 8VM, the most contrast of any of these pairs, it goes from a balls-to-walls metal album to a proggy and melodic one
SC to BC&SL, these are bit less different from each other, but SC was a bit more experimental (POW, Repentance) and heavy (TDEN) while BC&SL rests in influences and typical prog ideas
ADTOE to DT12, these are also a bit less different, but I'd say DT12 definitely focuses more on it's songs and melodies while ADTOE has a lot of songs that are long and a bit heavier than some of the stuff on DT12
So I'd say DT13 will be a bit experimental, a little less safe, maybe darker and heavier than the last album. They always seem to want to shake things up a little.
-Marc.