I have tested wireless scanning and printing on Android smartphone. You need to install HP All-In-One Printer Remote app for scanning. The Android smartphone & the HP printer should be in the same wireless network, Open up the app, it discovers the available HP printer, and you just need to hit 'Scan' button. The scan will be shown in the App as a picture, you can hit 'PDF' button & it will even save it as a PDF.
Similarly, for wireless printing from Android smartphone, install HP ePrint App. It will set-up a 'share intent' handler for Android. From any application, hit 'share', the HP ePrint will show as a handler, and if you click it, the document will be sent to the printer.
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Before Diwali I got a great price from Amazon.in (see my earlier post in this thread), I see that the current retail price hovers around 5800. You might want to wait for a while if you don't need it urgently. Also note that sometimes the Amazon offers are kind of 'hidden' - The item description shows the current price, then you will see something like "10 offers from 5,880.00" - Click on the 10 offers, then in the seller description you'll see a bold text 'additional 10% off, available at checkout'. You've to add to the cart and proceed to checkout, then you'll see the final discounted price.