I've seen two this morning, both new kind, both destination Lewisham.
one on the upnunder and one at Shadwell.

I'd like to also add myself to the "3LR spotter" list. Canary Wharf,
pulling out towards Heron Quays, new rolling stock, 9:15-ish.

As with all these things, actually seeing one was something of an anti-
climax. It's a slightly longer version of what I've been getting on for
years.