While the camera is shooting at 10fps, the viewfinder seems to remain blank. So, until the burst is complete, you have no idea of what you are looking at.
As OneGuy noted above, and just to confirm - the camera does indeed display a series of the last image taken, so you get a series of flickered shots that are roughly 1 frame off - I couldn't tell you whether or not it would be sufficient to replace OVF during burst shooting as I haven't tried it - but it doesn't go blank.
Also, later the camera needs about 50 seconds to process the burst. Though this may vary from card to card,
Apparently it varies extremely widely from card to card - using the Sony Memorystick Pro Duo HG, it apparently takes roughly 14 seconds to clear the buffer, according to current users of the camera in 10fps mode. That's a massive difference from 50 seconds. So apparently the card is crucial.[/quote]
Sony DSLR-A68 / Sony 18-250mm / Minolta 50mm F1.7 / Tamron 150-600mm / Minolta 300mm F4 APO
Sony A6300 / 18-55mm F3.5-5.6 / 55-210mm F4-6.3 / 10-18mm F4 / 35mm F1.8 / 16mm F2.8 / FE70-200mm F4 G OSS / FE70-300mm F4.5-5.6 G OSS / via manual adapter, lots of Pentax K mount, Konica K/AR mount, and Leica M mount manual lenses