The version 2.6 is the 14th release of RPi-Monitor and the first to be available in the store.
Next versions will also be installable from the store...
The dedicated page is available here : http://store.raspberrypi.com/projects/rpi-montor.
RPi-Monitor will continue to be installable using the standard process using the .deb package which have the advantage to not be dependent of any Graphical User Interface.
Here are the instructions (directly extracted from PiStore web site) explaining how to use the PiStore:
Download ClientTo download and use apps from the Pi Store you will require the Pi Store application.
If you're using the official operating system image, the Pi Store will already be installed on your Raspberry Pi, but if you need to reinstall it you can download it from the official repository.
Open a terminal window and type:
sudo apt-get update && sudo apt-get install pistore
Why do you need the Pi Store application?Silent installs: Enable this feature and you don't have to worry about clicking through an installer! Download the app and next thing you know you'll have a notification saying it's ready to go.
Product updates: Get automatic updates to the items in your library as soon as they're released.