Microsoft’s Surface Pro 3 tablets were recently discounted to $150 off retail price. The timing of the sale is a little suspicious, and many people claim that the sale is due to the fact that Microsoft is preparing to release the Surface Pro 4.
Here’s how the pricing breaks down on the (now discounted) Surface Pro 3 models:

• Surface Pro 3 w/ Core i5 4300U (1.9GHz to 2.9GHz) and 128GB SSD: $899, down from $999 (save $100)
• Surface Pro 3 w/ Core i5 4300U (1.9GHz to 2.9GHz) and 256GB SSD: $1,149, down from $1,299 (save $150)
• Surface Pro 3 w/ Core i7 4650U (1.7GHz to 3.3GHz) and 256GB SSD: $1,399, down from $1,549 (save $150)
• Surface Pro 3 2/ Core i7 4650U (1.7Ghz to 3.3GHz ) and 512GB SSD: $1,799, down from $1,949 (save $150)

The entry-level Surface Pro 3 is the only one that isn’t discounted by $150. The higher level models, however, all received $150 discounts.
To make the deal even sweeter, Microsoft is even throwing in a free sleeve valued at $40 with all Surface Pro 3 purchases. You have 14 different cover designs from which to purchase.
If you want one of those nifty Surface Pro Type Covers, you can get one at a discounted price of $130.
You can find the Surface Pro 3 sale here. It looks like the sale is only available in the United States, as Canadian residents are redirected to the regular pricing.

What is the Surface Pro 4?

Surface Pro 4 rumors are heating up, with some sources pointing towards a July 2015 launch.
One source claims that there will be two versions of the Surface Pro 4, including a 1.1GHz dual-core processor version and a 2.4GHz CPU version, both of which will use Intel’s mobile chips.
Some rumors also suggest that Microsoft will release a 12-inch tablet and a 14-inch tablet, with both displays running at 2160×1440.
Other key differences include an upgraded webcam.
All of these features are being added to the Surface Pro 4 because of the rumored announcement of the iPad Pro. Apple is reportedly targeting business users with an upcoming tablet called the iPad Pro. Microsoft aims to hold onto as much of that market as possible.
In any case, it could be a big summer for Microsoft with the release of Windows 10 and a new Surface product lineup.