The major features that are missing from ADLS Gen2 are premium tier, soft delete, page blobs, append blobs, and snapshots. The major features that are in preview are archive tier, lifecycle management, and diagnostic logs. Check out all the missing features at Known issues with Azure Data Lake Storage Gen2.
Note that underneath the covers, ADLS Gen2 uses Azure Blob Storage and is simply a layer over blob storage providing additional features (i.e. hierarchical file system, better performance, enhanced security, Hadoop compatible access).
Click through for a bullet point list of useful information.