GEORGE PEREZ'S SIRENS #6 (Cover A) (Jul 2015)
Boom! Studios

According to previewsworld.com - these are the shipping dates.

PREVIEWSworld's Chase/Incentive Variants Checklist

"Variant" covers are the big prizes for die-hard comic collectors. These rare editions initiate the ultimate treasure hunt as they are very limited in quantity — which makes them all the more desirable for completists. To assist collectors in obtaining these ever-elusive comics, PREVIEWSworld offers this updated checklist of Chase and Incentive Variants, and when they are expected to arrive in your local comic shops.

NOTE: Availability of these comics is extremely limited, so please check with your retailer for pricing and details. To find your local store, check out the Comic Shop Locator Service!

JAN151120	GEORGE PEREZ SIRENS #4 10 COPY SPOTLIGHT VAR	PI	05/27/15
JAN151121	GEORGE PEREZ SIRENS #4 25 COPY PENCILS RIGHT VAR	PI	05/27/15
JAN151122	GEORGE PEREZ SIRENS #4 50 COPY PENCILS LEFT VAR	PI	05/27/15
MAR151048	GEORGE PEREZ SIRENS #5 10 COPY SPOTLIGHT VAR	PI	05/27/15
MAR151049	GEORGE PEREZ SIRENS #5 25 COPY PENCILS RIGHT VAR	PI	05/27/15
MAR151050	GEORGE PEREZ SIRENS #5 50 COPY PENCILS LEFT VAR	PI	05/27/15

GEORGE PEREZ'S SIRENS #4 (Cover A) (27 May 2015)
Boom! Studios

George Perez Sirens #4
By: George Perez
Type: Comics
Genres: Superhero
Series: Sirens
Publisher: Boom! Studios
Pub. Date: May 27, 2015 (originally listed for 18 Mar 2015)
Availability: Pre-Order
UPC: 84428400408404011

As the Sirens finally come facetoface with the forces that imprisoned and scattered them across time, another complication arises: a zombie invasion of Earth!

Vu: If Sirens #4 is pushed to May, that will likely mean that Sirens #5 will be pushed back to July or August (since Sirens #5 was listed for May 2015).