Zynga proceed yesterday in changing particular parts of the time-limited mission. At least now we all have the time to conclude it without the need of paying RPs, although a few bugs from the past exist in this mission as well.
In the 4th part of the latest mission there is a job asking us to collect 20 construction workers. A few of us had this job already auto-completed. Take a look at your inventory. Are there any construction workers left? More than 2,000 were removed from me.

Earlier today, we re-tuned
Mission Event: End Of Days
to reduce the difficulty of some tasks that ended up be more difficult
than intended. We made these changes quickly so that players will have
enough time to
complete Mission Event: End Of Days.
We would also like to assure those of you who spent RP to complete any
mission tasks that we will be refunding that RP next week.
Thanks,
The Mafia Wars Team
EDIT: A few more changes have been spotted! We can now probably complete the mission without spending a single Reward Point now. Enjoy!
Zynga have heard the player's cries and have decided to make the End Of Days mission simpler and quicker to complete. A notable change is on Part 1 of the Mission. Instead of making 18 items from the Speakeasy in Chicago as required, Zynga have reduced and changed it to only 6. Hopefully there would be a few more changes so that we'll have enough time to complete without spending any Reward Points..
Before
After
The End Of Days Mission Event was pushed out earlier today. Seems like Zynga is trying to grab as much money as possible from the existing players of Mafia Wars. I doubt you would be able to complete this Mission without spending a single Reward Point. Either way...Good luck on completing this Mission ..
All mission images, and titles for this post were taken from the
MW LootLady Blog post made by Jennifer.
Part 1
Alpha
Part 2
In The Beginning
Part 3
The Big Bang
Part 4
Redemption
Part 5
Resolution
Part 6
Retribution
Part 7
Armageddon
Part 8
With A Whimper
Part 9
Omega
Part 10: Bonus Mission
Post Script
A new Mission Event is out, and it is named as "End Of Days" this time round. We currently have 13 days and 17 hours to complete it.
These items are probably rewarded for completing each part of the mission. Good luck!