Merlin Series 4 Episode 1 promotional photos + some new ones, & just today Episode 2 photos released (behind the scenes 2 B posted next)

update: behind-the-scenes & Merlin Series 4 Episode 2 "Revival of the Witch (part2)" photos
plus Merlin Series 4 trailer & BFI Q&A session with Merlin cast video (Warning: Spoilers!)
Merlin Series 4, Episode 1 "Revival of the Witch 1" promotional & screen-caps:

All photos below:  Copyright: BBC Pictures

Guinevere (played by Angel Coulby) & Lancelot (played by Santiago Cabrera)

Merlin (played by Colin Morgan)

Morgana (played by Katie McGrath)

from left to right: Sir Elyan (Adetomiwa Edun), Sir Percival (Tom Hopper), Prince Arthur (Bradley James), Sir Leon (Rupert Young)

The Knights of Camelot + Merlin & Arthur

Prince Arthur (Bradley James) & his Knights

"Old Merlin" (Colin Morgan)

The Lady Morgana (Katie McGrath)

Prince Arthur & the Knights of Camelot in armor

from left to right: Sir Leon (Rupert Young), Sir Gwaine (Eoin Macken), Sir Lancelot (Santiago Cabrera), Prince Arthur (Bradley James), Sir Elyan (Adetomiwa Edun), Sir Percival (Tom Hopper)

Merlin Series 4, Episode 2 "Revival of the Witch 2" promotional & screen-caps:
All photos below:  Copyright: BBC Pictures

[Arthur's] uncle Agravine (Nathaniel Parker)

Sir Gwaine (Eoin Macken)

Sir Elyan (Adetomiwa Edun) w/ Sir Percival (Tom Hopper) in background

Obviously, they're looking at somethig of interest.. What could it be!!!

Lancelot (Santiago Cabrera) thinking about the same conundrum as the Knights above..

Prince Arthur (Bradley James) just standing there.. thinking about the difficult issues a Price of Camelot has to deal with.. 

General Promotional Images for Merlin Season 4:

Prince Arthur / Arthur Pendragon (Bradley James) in armor, with a sword.

The [Evil] Lady Morgana (Katie McGrath)

The [Evil] Lady Morgana [closer up] (Katie McGrath)

Sir Leon [my personal favorite] (Rupert Young)

Sir Gwaine (Eoin Macken)

Sir Elyan (Adetomiwa Edun)

Merlin (Colin Morgan)