Their staff got smooshed together with Pivotal and a few other acquired odds-and-ends and largely set to work building a suite of Kubernetes-related products under the “Tanzu” brand. This included a Kubernetes manager (TKG) and an application platform (TAP) that were supposed to replace the BOSH-based Kubernetes installer (TKG-i, formerly known as PKS) and application platform (TAS, formerly known as PCF, better known as Cloud Foundry).
They got stirred around a few times via reorg, then the Heptio founders retired. Last I heard everyone in Tanzu was trying to get themselves reclassified as somehow part of the Cloud Foundry/BOSH stuff because it has significant revenue and was believed to be safe(r) from Broadcom layoffs.