Nothing's really been specified about what will be coming from Shrapnel, aside from at least four issues of it courtesy of the Kickstarter.
Given the title, I'd expect short stories set in the universe, similar to the anthology of the same name from the 1980s.
BattleTechnology (as well as Mech Magazine, MechForce Quarterly, and Commando Quarterly) also had fiction, to which they added scenarios, rules variants, designs, in-universe news reports, product reviews, sourcebook-style material (planetary write-ups, character profiles, equipment guides), painting guides, and both in-universe and gaming-perspective strategy and tactics tips.
I wouldn't think we'd need new 'Mech designs, equipment guides, or other sourcebook supplements in Shrapnel, since Catalyst does a fine job of delivering such materials (Touring the Stars, XTROs, etc.) CamoSpecs and other sources can deliver the hobby-specific painting tips, and magazine-based product reviews seem quaint in the age of the Internet. Thus, I'd expect (though I'm very open to being surprised) it to be fiction, scenarios, tactics & strategy guides, and in-universe news reports, primarily.