There are plenty of A4 inkjet all-in-ones, but if you're looking for a printer that can handle A3 paper, your choice is limited. Brother has been making large inkjet all-in-ones for several years and its MFC-J6910DW includes both duplex print and copy, and wireless connection.
Quick and easy duplex copies; Three-way paper feed; Low running costs
Poor plain paper prints; Insipid colour copies; Repeated paper mis-feeds