MBP 15" mid-2012 running Sierra 10.12 public beta 6 and DisplayLink 2.6 beta 2 (2.6.74951) with three external monitors (one HDMI on TB port, two DisplayLink on Lenovo ThinkDock).
In previous Sierra betas and with previous DisplayLink drivers (2.6 beta 1 and previous), the system was basically unusable with the DisplayLink displays connected. DL displays went black and came back every few seconds, had serious graphic glitches, system would crash to login screen when activating Mission Control, windows contents were corrupted, had very severe mouse lag.
With 2.6 beta 2 and 10.12 public beta 6 things have improved considerably. All of the above problems have been corrected with the exception of the corruption of windows contents, which remains as bad as ever. Unfortunately, that's a showstopper so I still can't use Sierra on this system.
I've attached two screenshots of a displaylink.com page running in Safari, one with the content displayed correctly (window was on HDMI display) and one with content corrupted (window was on DL display). Most webpages behave similarly, and see similar problems with many other programs (App Store, iTunes, Photos, ...).
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