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Na Bith Mo Riocht Tá!
Unfortunately, the Ki Focus entry has little to do with Weaplements other than the fact that the assassin uses them. It still doesn't clear up the question as to what parts of the magic weapon entry can be used when a Weaplement is used as an implement as opposed to when it is used as a weapon.
It's entirely possible I'm just showcasing my ignorance here, but I respectfully disagree. If I read it right, Assassins can use their Ki Focus through a weapon, effectively making it their implement.
If you have a magic ki focus and wield a magic weapon, you choose before you use an attack power whether to draw on the magic of your ki focus or to employ the magic of your weapon. Your choice determines which enhancement bonus, critical hit effects, and magic item properties and powers you can apply to attacks with that power. You can’t, for example, use the enhancement bonus of your ki focus and the property of your magic weapon with the same attack power.
The bold portion, along with the red portion, seems to indicate that you can use either your implement bonuses/effects or your magic weapon bonuses/effects, but not both, with a power. If you can use either, it looks like that means you can indeed use the 'enhancement bonus, critical hit effects, and magic item properties and powers you can apply to attacks' of your magic weapon with powers. However, it does specifically limit it to powers you can apply to attacks.
So for example, let's imagine my Assassin has a falchion that does extra flame damage along with a ki focus +2. He uses his Inescapable Blade power against an opponent. The above seems to read that he can either apply the +2 attack/damage and the +2d6 critical effect of his Ki Focus or the flaming property of the falchion to that power . . . but the weapon's flaming power is definitely one of his choices.
Does this apply, or is the thread topic completely different? If so, I apologize - as I said, I'm a 4E newbie and am really just trying to grasp some of the fine points of the game.