I don't see the GRASS toolbar in QGIS 2.10 (Pisa). There are still GRASS commands in the Processing toolbox. I know there was some upgrade of GRASS for 2.10. Is the toolbar not available anymore? If so, how would you make a mapset, etc?
Go to Menu Bar / View / Panels and check, that its enabled (should be already by default) Go to Menu Bar / View / Toolbars and check, that its enabled (should be already by default)
Check this page for the development progress: http://www.gissula.eu/qgis-grass-plugin-crowdfunding/progress.html
I assume you use QGIS 2.10 with GRASS 7. The site above states that mapset management will be implemented for QGIS 2.12, whereas in QGIS 2.10
GRASS plugin browser and add layer tools removed, substituted by standard QGIS browser.
I.e. at the moment you can use the QGIS browser to add, rename, move GRASS layers and you can even import layers just by drag and drop (watch the video).