I copied and pasted the information from the email. As far as I can see there is no negative impact for me. We arrive the day before. My assumptions is that this is related to low and high tides. I am sharing this because others may be impacted and might want to know ahead of time.
ITINERARY CHANGE NOTIFICATION
Please be advised that due to operational reasons, Koningsdam will now depart Vancouver at 4:00pm and all guests must check in by 3:00pm. As a result of this change, flights into Vancouver should arrive no later than 1:00pm on embark day. For Flight Ease guests with early-arriving flights, you will be rebooked automatically and advised of your new air schedule. For guests with independent arrangements, please rebook flights that arrive before 1:00pm. Should you incur unexpected expenses such as air change fees, reimbursement requests may be submitted for consideration via the form at http://*****/HAL_CHGFEE Additionally, we have revised our call times in Ketchikan, Alaska. The revised itinerary displays in full below. We regret any inconvenience these changes may cause and look forward to welcoming you on board.
This is the new Itinerary:
Day
Date
Itinerary
Arrival
Departure
SAT
06 AUG
Sail from Vancouver, B.C., CA
4:00pm
SU
07AUG
Scenic Cruising The Inside Passage
MO
08AUG
Tracy Arm Inlet
Service Call Shore Excursion Guests Only
9:00am
9:30am
MO
08AUG2
Juneau, Alaska, US
1:00pm
10:00pm
TU
09AUG2
Skagway, Alaska, US
7:00am
8:00pm
WE
10AUG2
Glacier Bay
Cruising Only Route/Time Subject To Weather/Ice
7:00am
4:00pm
TH
11AUG
Ketchikan, Alaska, US
11:00am
7:00pm
FRI
12AUG
Scenic Cruising The Inside Passage
Cruising Only
SA
13AUG
Debark Ship Vancouver, B.C., CA
7:00am