can anybody verify that in the new OData endpoint of SharePoint 2013 found at /_api/ does not implement the keywords $inlinecount and $count? ListData.svc has it implemented.
Example:
/_api/web/Lists/getbytitle('listname')/items?$inlinecount=allpages <-- No count in output
/_vti_bin/ListData.svc/listname?$inlinecount=allpages <-- Has count in output.