Hello Martin, to my knowledge there isn't any WCG-promoting stuff available...(!!??!!) :( But I still want two of those t-shirts, and also warmer long sleeve version for winter time. Actually I'm gonna print them myself if official version is not coming soon, I'm just so tired of waiting. I'll also print narrow stickers (suitable for display borders) to promote World Community Grid.

If WCG (IBM) wanted to make money out of T-shirts and other merchandise then let them try, but if they want to build a community all they need to do is to make artwork available for download as image files. There are plenty of companies all over the world who can print those onto T-shirts, polo-shirts, fleeces, mugs, pens and such like, and we could arrange that for ourselves. And surely "approved" artwork would be better than us trying to do it ourselves?

Well, I see a pattern here... This has been going on for about 12 years now...
Here are some clips from the forums:
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Thread: "WCG T-Shirt! High Resolution WCG picture, banner, sign?", Jul 2005, "lawrencehardin", Former Community Advisor:
"My opinion is that the logo is a trade mark, which means that lawyers will always resist allowing indiscriminate use of it. I have always urged people to develop unofficial logos for the World Community Grid to allow unbridled creative uses. Since the current chevron emphasizes the Grid (in our current loosely-coupled cluster of computers), I suggest that we emphasize the World, by creating various types of globes."
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Thread: "WCG T-Shirt! High Resolution WCG picture, banner, sign?", Jan 2012, "bbover3", World Community Grid Admin:
"We'll put this on the to-do list for 2012 and see what we can do to get t-shirts. The support team would like some as well."
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Thread: "We need World Community Grid t shirts!", Nov 2012, "jeffdeham":
"I have been looking for World Community Grid t shirts to buy with no luck. It would be great to be able to proudly wear them to work and other places."
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Thread: "Real badges", Oct 2014, several members... "We want t-shirts, badges, etc...!"
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Thread: "World Community Grid T-Shirt, where to buy it", Jan 2017 ,"jhindo", World Community Grid Admin:
"So there is no such World Community Grid branded merchandising available for sale at the moment, but we are looking into options."
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...btw meanwhile "Boinc USA" has nice t-shirts and stuff, even for a dog! (http://www.cafepress.com/boinc)

I would pay to have a custom shirt made with my badges over the pocket or down the sleeves. If they don't fit.. then maybe the current statistics over the pocket with the date.

I can't find any announcement. Are you sure this is 'official'?