First off, this does not mean that the Celtics will play on Christmas Day in 2015--there are uniform mockups for every team.
Here's a little more about them from UniWatch.com (which has detailed info and pictures of others):
It’s hard to see on the mock-ups, but the NBA logo above the NOB will be shown in a splotch of sealing wax, which is meant to evoke the feel of an old-fashioned Christmas card.
There will supposedly be “glazed sugar ornamental shiny surfaces” on the fabric and trim.
I like the fact that the jersey designers are taking steps to make them actually seem Christmas-y. Below are examples of a few others:
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Mark Van Deusen 5/13/2015 12:59:00 PM Tweet Edit