How are conflicts in the End of Turn sequence resolved?
The specific example we had last night was resolving whether the Avenger could Shift using the Bond of Pursuit [ddi] end-of-turn effect, when he had an Immobilised status imposed by the same target which lasted until the end of the target turn, i.e. resolving the ... until the end of the targets turn, he was immobilised, so he can't shift ... versus the ... but at the end of the targets turn he can shift
Bond of Pursuit
Hit ... If the target doesn’t end its next turn adjacent to you, you can shift a number of squares equal to 1 + your Dexterity modifier as a free action, and you must end that shift closer to the target.
When a creature is immobilized, it can’t move, unless it teleports or is pulled, pushed, or slid.
My understanding is both the start-of-turn and end-of-turn sequences are under the creatures control, so e.g. the order in the start-of-turn of applying ongoing damage and regeneration is up to the creature.