About sample naming convention, our intention is to highlight/emphasize the feature of the sample cordapp by adding "-FEATURE_NAME" at the end of the sample name. We will update the original sample names with the new convention in the next couple of days.
About using capitals in the package names, I will update accordingly.
All the other sample projects are named using lower case.
For some reason the two new projects added by @peterli-r3 (autoPayroll-CordaService and sendfile-Attachments) use capitals in the sample names.