Citrix originally released their Citrix Receiver app for BlackBerry 10 as a technology preview. Now they have pushed out an update that fixes some serious bugs that crept up with the latest OS versions. The app also seems to have left the technology preview stage and is now v2.0. The minimum OS version is now 10.2.0.1745 so keep that in mind. Thankfully Citrix has brought the update since BlackBerry really needs the app to appeal to more enterprises.
Check out Citrix Receiver free in BlackBerry World