List of Android devices to get the official Android lollipop

Though it would not be an exclusive list of all devices, here is a possibly good list -

Google
1. Nexus 4.
2. Nexus 5
3. Nexus 6
4. Nexus 7
5. Nexus 7 (2013)
6. Nexus 9
7. Nexus 10

Motorola
1. Moto E
2. Moto E - 2015
3. Moto G
4. Moto G- 2014
5. Moto X
6. Moto X- 2014
7. Moto DROID Turbo

HTC
1. One M7
2. One M8
3. One Mini
4. One Mini 2
5. One MP

Samsung
1. Galaxy Note 4.
2. Galaxy Note Edge
3. Galaxy S5
4. Galaxy S5 Mini
5. Galaxy Alpha
6. Galaxy S4
7. Galaxy S4 mini
8. Galaxy S6 and S6 Edge
9. Galaxy Note 3
10. Galaxy Note 2
11. Galaxy Tab Pro 8.4
12.Galaxy Tab Pro 10.1
13. Galaxy Tab Pro 12.2
14.Galaxy Tab S 8.4
15.Galaxy Tab S 10.5

LG
1. G3
2. G2
3. G Flex

Sony
1. Xperia Z Ultra
2. Xperia Z3
3. Xperia Z ultra
4. Xperia Z1
5. Xperia Z2
6. Xperia Z2 tablet

Oppo
Oppo Find 7

One Plus
One Plus One

Asus
1. Zenfone 4
2. Zenfone 5
3. Zenfone 6

This is just an indicative list. It would be a little tough to include all the devices that are getting the official Lollipop OS. Android being an open source platform has a large number of manufacturers and models running on it. I have made an attempt at listing out a few of them based on manufacturers.