Launched in early 2012 as "a new type of BattleTech fiction", Blitzkrieg is a line of electronic short novels published through Catalyst Game Labs in EPUB format. It is meant to augment BattleCorps, not replace it, and the books were made available to BattleCorps subscribers in PDF format for no extra cost accordingly.
The spelling of "Blitzkrieg" is somewhat arbitrary: In announcements, Blitzkrieg has been spelled thusly or alternatively, in all-capital letters; on published book covers, it is also spelled "BlitzKrieg" (with a capital "K" in the middle). Author Steven Mohan Jr. said that he thinks of it as a regular German noun with a capital letter at the beginning, but none in the middle.
The first two Blitzkrieg publications were Ghost Bear's Lament (Part One: Instrument of Destruction) and Operation Ice Storm (Part One: The Frost Advances), published along with the Blitzkrieg announcement on 13 February 2012.
The Blitzkrieg format was discontinued after the publication of the altogether four parts of the two aforementioned two-part novellas plus another stand-alone novella, Vengeance by Jason Schmetzer. It was apparently lumped in with the BattleTech Legends format of EPUB novels and anthologies from 2015 onwards.