I don't want to pour cold water on this great story but history shows that in the short term index entry can be a mixed blessing because price tends to weaken thereafter as the index-tracker funds have usually already bought their holdings in anticipation of entry and the buyers' appetite is satisfied.
This scenario is consistent with this week's rise ahead of the announcement and the absence of other news to drive the price forward.
PLA Price at posting:
0.0¢ Sentiment: Buy Disclosure: Held