After the update of new grab apps interface, i realise that the price has increased by RM1. I notice this because i use grab for the same route almost everyday and the distance ia not far, the price has always been RM5 but now it has been fluctiating around RM5-6. Anyone feeling same as me?

Go look at Taxi rate and judge grab fare rate. Without surge i am pretty sure is below RM1.5 per km.
Look at the demand because of the rain, consider yourself lucky because surge at RM1, i've seen customer paying RM13 for about 2km ride.

And before complain expensive, have u try to hail taxi? AFAIK taxi rate is RM3 (First 1km or 3min), then additional RM2 for booking at your doorstep. That alone cost RM5 for the first km. Go and try it out and compare with Grab fare.

A lot of young generation complain this and that never been through the past ages where taxi charge absurd upfront fare and their bad attitude. 

pick up one rider from TBS last Sunday evening. Normal price w/o surge price....and usually on Sunday evening price from TBS was higher.

when price low, rider happy2 not complain.
suddenly one day, price up due to high demand or insufficient supply of supply, they complained like shit in social media. claiming taxi was cheaper.

U all still don't understand why the cheap fare exist in the first place, it was Uber and Grab cutting throat each other to gain market share, u think Uber driver want to drive u 75km for that pathetic low fare after commission, think twice about that, and that is why the major shift of Uber driver hop to Grab while Grab giving lots of incentive back then. The balance u mention is long gone when Uber keep cutting its fare, without surge or boost, Uber earning for driver is just pathetic low without those. Uber is subsidizing a lot by giving out incentive and boost back then before the sell out.

Fare increase - Yes
Rewards point reduce - Yes
Push u to use Grabpay to earn more grab points - Yes

U still naive think that low fare subsidize to customer will forever exist in your life? they are not charity organization, they are profit seeking company to earn something from u, be it now or future, now u can see why they keep promote their grabpay after they become no.1. Their motive is to push their e-wallet become leader in SEA and become another version of alipay or wechatpay. Once they set foot in this huge eco-system, they have bargaining power to negotiate with all the merchant and customer, then start to earn something from u. After all i still see Grab as a technology Company and eat up chunk of market share for taxi industry.