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Lurrus of the Dream-Den is unbanned.
See the official announcement.

Effective May 18, 2020: Lurrus of the Dream-Den is banned in Vintage.
WotC announcement.

Effective 22 November, the following card is restricted in Vintage:

• Narset, Parter of Veils

See the WotC announcement

Read the B&R list announcement at WotC's website (effective date: August 30, 2019):

• Karn, the Great Creator is restricted.
• Mystic Forge is restricted.
• Mental Misstep is restricted.
• Golgari Grave-Troll is restricted.
• Fastbond is unrestricted.

From 5 July on, a new Mulligan will be enforced:
The London Mulligan
Better for combo? (Bazaar of Baghdad)

Read the B&R list announcement at WotC's website (effective September 1, 2017).

• Yawgmoth's Bargain is Unrestricted
• Monastery Mentor is restricted
• Thorn of Amethyst is restricted

Also note the Planeswalker rules change:
Starting with this set, all planeswalkers past, present, and future will have the supertype legendary. They will also be subject to the "legend rule." The "planeswalker uniqueness rule" is going away. What does this mean? In short, everything that's true about legendary permanents will now be true about legendary planeswalkers.

From 24 April on, Gush and Gitaxian Probe are restricted.

Effective April 8, Lodestone Golem is restricted.

More changes to the banned & restricted list, effective 2 October 2015:

• Chalice of the Void is restricted
• Dig through Time is restricted
• Thirst for Knowledge is unrestricted

See the announcement and explanations here.

After the unrestriction of Regrowth in May 2013, nothing has changed. But this month, two changes to the B & R list:

• Treasure Cruise is restricted
• Gifts Ungiven is unrestricted

See the link for the explanations.