Web Components
Axel Rauschmayer hits the nail on the head regards framework madness:
A rich set of widgets. In my opinion, this is the biggest deal about Web Components (and, to a lesser degree, about Polymer). We finally get a large set of widgets that we can use anywhere.
Finally, we could get to a decent set of financial widget for building Single Dealer Platforms (SDP) e.g. a currency pair web component (Shadow DOM, <template>, custom elements, MDV, new CSS primitives)
Tales from a Trading Desk 
Hi Matt,
Caplin has of course been providing exactly this for some time, which is why Caplin’s components and widgets (trade tiles, tickets, grids, charts, blotters, alerting etc) as well as our HTML development framework are being used by a number of leading banks to build their new HTML SDPs.