Those OW 4.2s are going to make a lot of people happy looking for low-profile surround speakers.
The new woofers aren't quite as pretty with the 'outie' plastic dustcap, but if the performance is better that's what really matters.
I wonder if this means a Uni-Fi refresh is in the works as well. I haven't paid a tremendous amount of attention to the Debuts just because the Uni-Fis offer a lot more performance for a small price premium (and because coaxial drivers are cool) but I know the Debuts have been well regarded as music speakers, with the aggressive treble roll-off probably being the only thing holding them back from being more popular as HT speakers as well. If Elac has opened up the top end with these they could be real winners all-around.
HT: Sony 940C, Oppo 203, Harman/Kardon DPR1001, Infinity Interlude IL40 x2, Infinity Interlude IL36C, Infinity MS-1 ii x2, Infinity MSW-1
Computer: Elac Uni-Fi UB5 x2, Elac Element EA101EQ integrated amp, SVS SB-12NSD
Dedicated 2-channel: Infinity Intermezzo 4.1t towers, Bluesound Node 2, Emotiva PT-100, Crown XLS 1502, Furman PL-8C