Image Credit: Digi-Wo We’re on the edge of August, and next month is shaping up to be big for Windows Phone fans. Nokia may come out swinging in a rumored late September event that looks to be the venue where they show off their first Lumias based on the Windows Phone 8 GDR3 update. But off in the distance, a new handset seems to be emerging from the shadows. The Verge has been tipped with details about Nokia’s upcoming Windows RT tablet, which reportedly goes by the codename ‘Sirius’. As other rumors have pointed to before, it looks like Nokia is sticking with an unsurprising hardware setup for their Windows RT slate. That includes a 10.1-inch 1080p display, a quad-core Snapdragon 800 processor, 2 GB of system …