AIUI we have a situation where some miners are enforcing stricter rules than others.
If the strict miners significantly out mine the loose ones then not much will happen. The blocks that don't pass the strict rules will quickly be forked off and die and noone sensible accepts a one-block-confirmed transaction for anything important.
However if the loose miners out mine the strict miners you get a long lasting fork between the strict and loose miners. People whose clients only enforce the loose rules will see what is going on in the loose fork. People whose clients enforce the strict rules will see what is going on in the strict fork. The two forks will most likely contain most of the same transactions but there may be some cases where someone manages to engineer that the same bitcoins are transferred to different places in the two forks, newly mined coins will also go to different people in the two forks.
If the mining rate of strict and loose miners are approximately equal then you have a mess. The two forks could run in paralell for some time and then the strict fork could either hit a run of good luck or be boosted by miners switching to the strict rules and kill the loose fork. AIUI that is the present situation.
It is most likely this will end with the strict miners outnumbering the loose ones, any transactions that only happened on a loose branch will then be killed.