Tony Northrup recently posted a video review on Canon’s new EF 50mm f/1.8 STM lens compared to old EF 50mm f/1.8 II lens. Both lens are cost $125 in US.
Canon EF 50mm f/1.8 STM Lens
EF 50mm f/1.8 STM Lens More Sample Images

The new announced EF 50mm f/1.8 STM lens (Amazon | B&H | Adorama) is scheduled to be released on May 21, 2015. Here are several more sample images of this lens taken by Canon EOS 5D Mark III by DC. Watch.
EF 50mm f/1.8 STM Lens Sample Images

The new Canon EF 50mm f/1.8 STM lens now announced, available for pre-order at B&H Photo Video & Adorama for $125.00. Here are first official sample images of Canon EF 50mm f/1.8 STM lens.
EF 50mm f/1.8 STM Lens Announced, Price $125, Available for Pre-order Online
Canon USA has just announced the new Canon EF 50mm f/1.8 STM lens, the price for this lens is $125, now available for pre-order at B&H Photo Video & Adorama. This lens will be released on May 21, 2015 according to B&H. See sample images of EF 50mm f/1.8 STM lens.
First Images & Specs & Price of EF 50mm f/1.8 STM Lens
Fake Image of Canon EF 50mm f/1.8 STM lens
Photo Rumors today posted a leaked image could be upcoming Canon EF 50mm f/1.8 STM lens. This lens is rumored to be announced in this April along with a new non-L 70-300mm IS lens.
EF 50mm f/1.8 STM Lens to be Announced in April, 2015
According to latest rumors for CR, Canon will announce a new EF 50mm f/1.8 STM lens next month in April.