Here's my understanding of the chapter (IF I get this right...I doubt it though...):
The Sakura who just got stabbed is a clone. She (the clone) has been with us since the start of the journey, when the Real Sakura was captured in the tube.
However, C!Syaoran has been with us even before the start of the journey. So at the very beginning, C!Syaoran was in love with R!Sakura.
Throughout the journey though, C!Sakura has fallen in love with C!Syaoran (and C!Syaoran cares for her too, since he thought C!Sakura was the real one), and now C!Sakura is stabbed & probably will die! At the end of the chapter, I think it looks like C!Sakura turned into Sakura petals or something...
Now IF I got that right, I feel really bad for C!Sakura...And so who's R!Syaoran's Sakura then?